Neil deGrasse Tyson Discusses the Nature of Time, Time Travel, and Whether to Register Superheroes

Astrophysicist Neil deGrasse Tyson sat down with Jake Roper to discuss the nature of time and time travel in an interview for Vsauce3. Roper then joined Tyson and co-host Eugene Mirman in a segment of StarTalk Radio to talk about whether superheroes should be required to register their powers.